Analysis on vibration response characteristics of cross structure between shield tunnels and cross passage induced by the train

Aiming at the cross structure problem in Chinese railway shield tunnel, with by usingthe fitted formula for train vibration load, the dynamic characteristics of cross structures were studied by applying the time-history curves of vibration force of the track induced by wheel axles, which is used to simulate the effect of running train. The envelope curves of the major principal stress and the acceleration time-history range at the intersection locations were analyzed with different surrounding rock grades and train speeds. Furthermore, the time-history responses of acceleration at different longitudinal locations of main tunnels and cross passage were analyzed. Based on the research, the distribution locations of the major principal stress and the maximum acceleration at intersection locations as well as their variation trend with respect to the train speed and rock grade were then achieved. For particular projects, the attenuation proportion of dynamic response of adjacent parallel tunnels relative to that of the tunnel with running train was obtained, and the high-speed traveling effect of train may be divided into the approach section, the passing section, and the leaving section. The achieved conclusions provide a valuable reference for the construction of underwater high-speed railway shield tunnel. ©, 2015, Editorial Office of China Civil Engineering Journal. All right reserved.